The math doesn't add up jack ass. You are basically in the realm of 200k miles to see the cost savings on ah the money you just spent to be "efficent".
This is diesel bros new argument btw. That the truck gets better mpg there for it's better for the be environment.
That's old diesels that had no emissions controls. And that's just the engine. The rest of the truck has all been replaced.
Modern diesels do not last that long due to the emissions needed to control the pollution is a heavy tax on the motor and it's life.
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The egr is what causes the issues. They get clogged up leading to turbo failure.
Also keep in mind that gas vehicles started emissions back in the 70s and it was a mess also. Ruined reliability and power. Diesels didn't get emissions till 2007. So the reliability is still a factor.